Shareholders' Equity (Share-based Compensation - Narrative) (Details) (USD $)	12 Months Ended							0 Months Ended									12 Months Ended			0 Months Ended		12 Months Ended			0 Months Ended					12 Months Ended
	Dec. 31, 2013 plan	Dec. 31, 2012 plan	Dec. 31, 2011 plan	Dec. 31, 2012 Granite Corp. [Member]	Dec. 31, 2013 Granite Corp. [Member]	Dec. 31, 2013 Integrity Financial Corporation [Member]	Dec. 31, 2006 Integrity Financial Corporation [Member] plan	Dec. 19, 2013 Officer [Member] Second Anniversary of Grant Date [Member]	Dec. 19, 2013 Officer [Member] Third Anniversary of Grant Date [Member]	Dec. 19, 2013 Director [Member] First Anniversary of Grant Date [Member]	Dec. 19, 2013 Director [Member] Second Anniversary of Grant Date [Member]	Dec. 19, 2013 Director [Member] Third Anniversary of Grant Date [Member]	Dec. 19, 2013 Employees [Member] First Anniversary of Grant Date [Member]	Dec. 19, 2013 Employees [Member] Second Anniversary of Grant Date [Member]	Dec. 19, 2013 Employees [Member] Third Anniversary of Grant Date [Member]	Dec. 19, 2013 Employees [Member] Fourth Anniversary of Grant Date [Member]	Dec. 31, 2013 Restricted stock [Member]	Dec. 31, 2012 Restricted stock [Member]	Dec. 31, 2011 Restricted stock [Member]	Dec. 28, 2012 Restricted stock [Member] Officer [Member] Later of Lifting of Consent Orders or Second Anniversary of Date of Grant [Member]	Dec. 28, 2012 Restricted stock [Member] Officer [Member] Later of Lifting of Consent Orders or Third Anniversary of Date of Grant [Member]	Dec. 31, 2013 Stock Options [Member]	Dec. 31, 2013 2012 Incentive Plan [Member]	Jun. 20, 2013 2012 Incentive Plan [Member]	Dec. 19, 2013 2012 Incentive Plan [Member] Restricted stock [Member]	Dec. 19, 2013 2012 Incentive Plan [Member] Restricted stock [Member] Officer [Member] officer	Dec. 28, 2012 2012 Incentive Plan [Member] Restricted stock [Member] Officer [Member] officer	Dec. 19, 2013 2012 Incentive Plan [Member] Restricted stock [Member] Director [Member] officer	Dec. 31, 2013 Stock Compensation Plan 1993 [Member]	Dec. 31, 2013 Stock Compensation Plan 1993 [Member] Stock Options [Member]	Dec. 31, 2013 Stock Compensation Plan 1993 [Member] Stock Options [Member] Maximum [Member]	Dec. 31, 2013 2003 stock compensation plan [Member] Stock Options [Member]	Dec. 31, 2013 2003 stock compensation plan [Member] Stock Options [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans	5	5	5				3
Share-based compensation expense	$ 653,000	$ 3,000	$ 23,000
Share-based compensation expense related income tax benefit	250,000	1,000	9,000
Shares authorized for issuance																								1,800,000
Maximum number of shares of COB common stock each employee may be granted during any calendar year period																							100,000
Awards granted (in shares)																	158,302	110,059							158,302		110,059
Number of officers granted																										6	6	8
Award become exercisable period																														1 year		1 year
Award vesting period																														5 years		5 years
Award expiration period																															10 years		10 years
Number of shares available for grants						0																							0
Stock options assumed from acquisition (in shares)	0	0	78	78
Stock options exercisable (in shares)					0
Stock options expired (in shares)				78
Stock options granted (in shares)	54,060	0	0
Fair value of options granted (per share)	$ 3.27
Stock options exercised, intrinsic value	0	0	0
Stock options vested, grant date fair value	0		0
Stock options exercised (in shares)	0	0	0
Awards vested, fair value																	0	1,040	1,040
Award vesting percentage								66.67%	33.33%	33.33%	33.33%	33.33%	25.00%	25.00%	25.00%	25.00%				66.67%	33.33%
Unrecognized compensation cost related to non-vested share-based compensation arrangements	$ 2,500,000
Black-Scholes option pricing model, fair value assumptions:
Expected volatility, period of historical volatility																						6 years
Expected life of options																						6 years
Risk-free rate																						2.60%
Volatility rate																						29.60%
Dividend yield																						0.00%